From aae457de5558e166564bf50ed50c53acfa6b62cd Mon Sep 17 00:00:00 2001
From: Michael Krelin <hacker@klever.net>
Date: Fri, 31 Aug 2018 22:38:35 +0000
Subject: automatically calculate knob bore length

---
diff --git a/another.scad b/another.scad
index e4d79f9..915b184 100644
--- a/another.scad
+++ b/another.scad
@@ -29,9 +29,9 @@ module the_extruder(
  filament_guide_d = 4,				// PTFE filament guide diameter
  // knob properties
  knob_h = 10,
- knob_bore_l = 4,
  knob_indent_d = 4,
  knob_indents = 12,
+ knob_v_clearance = 1,
  // spring tensioner
  st_nut_d = 9, st_nut_h = 4,
  st_screw_d = 5,
@@ -408,6 +408,7 @@ module the_extruder(
 
  module knob() {
   ch = knob_indent_d/2;
+  knob_bore_l = body_h-protrusion_h-pulley_elevation-pulley_h-knob_v_clearance;
   translate([0,0,body_h+epsilon]) {
    mirror([0,0,1]) translate([0,0,-epsilon]) {
     difference() {
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